摘要
采用盆栽试验,研究了控释氮钾肥对海棠实生苗生长、磷钾利用率及土壤-作物系统中氮素平衡的影响.结果表明:控释肥的释放与海棠苗对养分的需求一致;控释氮肥显著提高了植株钾素的利用率;控释钾肥显著提高了植株氮素的利用率.施钾量相同情况下,控释氮肥(CN)和控释氮钾肥(NK)的株高、茎粗无显著差异,但均高于普通肥料(SF).植株干物质量、磷的利用率、钾的吸收量和利用率大小顺序均为:NK>CN>SF.施钾量对株高、茎粗无明显影响,但对NK处理的干物质量有显著影响.磷素利用率随控释钾肥施用量增加而显著提高,而普通钾肥施用量对其无明显影响.钾素利用率随施钾量提高而降低.氮素利用率大小顺序为NK>CN>SF,损失率顺序则相反,NK和CN的残留率无显著差异,但均高于SF.控释钾肥施用量对氮素利用率、损失率有显著影响,对残留率无明显影响.
A pot experiment was conducted to study the effects of controlled-release N and K fertilizers on mauls seedlings growth,their P and K use efficiency,and the N balance in soil-plant system.The results showed that the nutrient release from controlled-release fertilizers accorded well with the nutrient requirement of mauls seedlings.Controlled-release N fertilizer significantly increased the K use efficiency,and controlled-release K fertilizer significantly increased the N use efficiency.Under the same K application rate,the plant height and stem diameter under the application of controlled-release N fertilizer(CN) and controlled-release N and K fertilizers(NK) had no significant difference, while those under the application of common fertilizer(SF) were all higher.The plant dry mass and the P and K use efficiency were in the order of NKCNSF. Under the application of NK,the application rate of K had no significant effects on the plant height and stem diameter,but significantly affected the plant dry mass.The P use efficiency increased with increasing application rate of controlled-release K fertilizer,but was less affected by application rate common K fertilizer.The K use efficiency decreased with increasing application rate of K.The N use efficiency was in the order of NKCNSF,while the N loss rate was in adverse.The residual rate of NK and CN had no significant difference,but was higher than that of SF.The application rate of controlled-release K fertilizer had significant effects on the N use efficiency and N loss rate,but no significant effects on N residual rate.
出处
《应用生态学报》
CAS
CSCD
北大核心
2010年第9期2309-2316,共8页
Chinese Journal of Applied Ecology
基金
国家农业部"948"科技引进项目(971053)
农业部跨越计划项目(2001-跨8)
农业科技成果转化项目(农计函[2004]32号)
中国农业大学科研启动基金项目(ND200705)资助
关键词
控释肥
交互作用
氮钾比例
海棠
controlled-release fertilizer
interaction
N:K ratio
mauls.